A State Rarity Rank of S1 means: Typically 5 or fewer occurrences, very few remaining individuals, acres, or miles of stream, or some factor of its biology makes it especially vulnerable in New York State.

Global Rarity Rank:G2G3

A Global Rarity Rank of G2G3 means: Imperiled or Vulnerable globally - At high or moderate risk of extinction due to rarity or other factors; typically 80 or fewer populations or locations in the world, few individuals, restricted range, few remaining acres (or miles of stream), and/or recent and widespread declines. More information is needed to assign a single conservation status.

Did you know?
Post oak-blackjack oak barrens is a globally rare community that, in New York, is only found on Staten Island. Post oak wood is close grained, hard, and does not easily rot, so it is used widely for fenceposts, hence its name. It has also been used for railroad ties, construction timbers, and fuel.

There are an estimated 10 extant occurrences statewide. Our currently documented occurrence has good viability and is protected on public conservation land. Currently this community is known only from the North Atlantic Coast ecoregion in Richmond County on Staten Island. The acreage, extent, and condition of post oak-blackjack oak barrens in New York are declining somewhat rapidly. They are threatened by exotic species invasion, development, and recreational pressures.

The acreage, extent, and condition of post oak-blackjack oak barrens in New York are declining somewhat rapidly, primarily due to displacement from urban and suburban development and exotic species invasion.

The number, extent, and viability of post oak-blackjack oak barrens in New York are suspected to have declined substantially over the long-term. These declines are likely correlated with development and associated changes in landscape connectivity.